More than 50,000 people will be taking their place on the starting line in central London and organisers are prepared if runners fall victim to the heat.

Hugh Brasher, Virgin Money London Marathon event director, told the Daily Star: “We have a number of contingency plans in place in case of hot weather and we will be sending advice to runners and spectators later in the week.”

The highest temperature during marathon weekends was in 1996 and 2007, when hundreds of runners collapsed as the mercury rose to 22.2C.

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Dozens of police and paramedics rushed to his aid and took him to St Thomas' Hospital, where he died shortly after.

While two years earlier, 42-year-old Rob Berry died after crossing the finishing line.

Mr Berry was treated paramedics after the race, but did not recover and was sadly pronounced dead in hospital.

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